Evaluate
-\frac{5\sqrt{3}}{12}\approx -0.721687836
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-\frac{5\sqrt{3}}{4\left(\sqrt{3}\right)^{2}}
Rationalize the denominator of \frac{5}{4\sqrt{3}} by multiplying numerator and denominator by \sqrt{3}.
-\frac{5\sqrt{3}}{4\times 3}
The square of \sqrt{3} is 3.
-\frac{5\sqrt{3}}{12}
Multiply 4 and 3 to get 12.
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